JPH09291780A - Shaft mucker and caisson type pile executing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen working space so as to improve workability by using a shaft mucker having a drilling main body and a plurality of support arms for supporting the main body which are installed radially toward the inner peripheral wall of a vertical hole so as to be freely extended/contracted. SOLUTION: A support arm 20 is extended radially toward a vertical shaft inner peripheral wall 2a and fixed to a vertical shaft 2, a drilling device main body 10 is supported, the support arms 20 are then contracted and moved together with the main body 10 inside the vertical shaft 2. A strut is driven to be extended/contracted in contact with a bottom working face 2b, and the working face 2b is vertically moved by the main body 10. A vertically driving mechanism 30 is disposed between the support arms 20 and the main body 10 and the work ranges of the vertical directions are expanded. Further, a turning driving mechanism 41 is disposed on the main body 10, the inside of the vertical shaft 2 is photographed by a remote controller and work is carried out under a good environment such as on the ground. Drop preventing plates 7 supporting the support arms 20 are installed in the inner peripheral surface 5a of a pile 5. This, working space is effectively used by laterally moving the center position of the main body 10, and quick work is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft excavating device for excavating a shaft such as a shaft for a deep foundation pile and a method for constructing a deep foundation pile using the shaft excavating device.

[0002]

2. Description of the Related Art Construction sites for deep foundation piles often have bad construction conditions such as steep mountains and narrow slopes due to the characteristics of construction. Therefore, when excavating a vertical shaft, conventionally, it is difficult to put in a large-sized machine, and it depends on human power in many cases.

Explaining the outline of the excavation of the vertical shaft, the work includes drilling, charging, blasting, loading of scraps, and excavation (discharging). Also, in parallel with excavation,
Install piles such as corrugated pipes (corrugated pipes). Among the work, a boring machine is used for drilling, and a mini hydraulic excavator is brought into the bottom face of the shaft for mechanization for loading.

[0004]

However, in such a machine for excavation, there is no special problem in the case of soft rock where the ground is easily formed, but in the case of hard rock where the ground is difficult to form,
Regarding the drilling, it is the current situation that multiple workers press the drilling machine manually, and it is difficult to hold the posture of the mini excavator due to the reaction force of the ground when loading the gap. There is a problem in that

In addition, recently, as a loading machine,
It is also proposed that the guide rail is installed on the inner surface of the pile and extends vertically, and the excavator attachment is provided on the guide rail so as to be movable up and down. However, even in this shear loading machine, since the guide rail is fixed to the inner surface of the pile, in the case of hard rock, the posture of the shovel attachment may not be sufficiently maintained.
Also, since a long guide rail is installed in the shaft,
There is an inconvenience that the work space for the work of the shovel attachment and the work of excavating the pile is further narrowed.

In view of the above circumstances, the present invention provides a vertical shaft excavating device which can secure a wider working space, can more easily install the excavating device main body on the vertical shaft, and can stabilize its posture. A method for constructing a deep foundation pile using the shaft excavating device is provided.

[0007]

Means for Solving the Problems The first invention of the present invention is:
A vertical shaft excavating device having an excavating device main body for excavating a vertical shaft, comprising a plurality of support arms which are provided so as to extend and contract in a radial direction toward an inner peripheral wall of the vertical shaft and support the excavating device main body.

That is, when the support arms are fixed to the shaft by radially extending the plurality of support arms toward the inner peripheral wall of the shaft, the excavator body can be supported, and when the support arms are contracted, the excavation is performed. It becomes possible to move inside the shaft together with the device body.

A second invention of the present invention is characterized in that, in the shaft excavating device of the first invention, the shaft is provided with a pillar which is in contact with a bottom face of the shaft and supports the excavating device main body. That is, the vertical load of the vertical shaft excavator is reliably supported by the columns, and the horizontal position of the vertical shaft excavator is held by the support arm.

A third invention of the present invention is characterized in that, in the shaft excavating device of the second invention, the support column is extendable and retractable. That is, it is possible to move the excavator body up and down with respect to the bottom face by extending and retracting the pillar.

According to a fourth aspect of the present invention, in the shaft excavating device according to any one of the first to third inventions, the shaft excavating device is provided between a plurality of supporting arms and the excavating device main body, and vertically drives the excavating device main body. It is characterized by having a lifting drive mechanism.
That is, the vertical working range of the excavator body is expanded.

A fifth invention of the present invention is characterized in that, in the shaft excavating device according to any one of the first to fourth inventions, a swivel driving mechanism for swiveling and driving the excavating device main body is provided. That is, the horizontal working range of the excavator body is expanded.

A sixth invention of the present invention is the shaft excavating device according to any one of the first to fifth inventions, which comprises a camera provided in the excavating device main body for photographing the inside of the shaft, and a remote controller. The remote controller is characterized by having a controller body for remotely controlling the excavator body, and a monitor for outputting an image captured by a camera. That is, the operation work of the excavator body can be performed in a suitable environment such as on the ground.

A seventh invention of the present invention is a method for constructing a deep foundation pile in which a vertical pile is excavated by using the vertical shaft excavating device of the first invention, and a cylindrical pile is installed in the vertical shaft. The surface is provided with a fall prevention plate that supports a support arm of the shaft excavator. That is, the vertical shaft excavator is supported by the fall prevention plate.

As another invention of the present invention, in the shaft excavating device of the fifth invention, a swivel driving mechanism drives the excavating device main body around a first swivel center line, and a first swivel driving mechanism, Some of them are characterized in that the swivel drive mechanism is provided with a second swivel drive mechanism that swivels around a second swivel centerline that is eccentric to the first swivel centerline.

According to the present invention, since the central position of the excavator body can be moved in the horizontal direction, the blind spot in the horizontal working range of the excavator body such as directly below the excavator body can be further reduced. It is possible to effectively use the work space, and further it is possible to expand the horizontal movement range. Therefore, the work can be performed more easily and quickly.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a shaft 2 under construction is formed in the ground 1, and a tubular pile 5 is formed in the shaft 2.
Are fitted and installed. The pile 5 is composed of a corrugated pipe having a corrugated vertical cross section.

In the pile 5, a vertical shaft excavating device 100 suspended by a crane 301 is arranged. The vertical shaft excavating device 100 includes an excavating device main body 10 for excavating the vertical shaft 2 and the vertical shaft 2. A plurality of support arms 20, 20, ... Supporting the excavator body 10 are provided so as to extend and contract in a radial direction toward the peripheral wall 2a, and a plurality of support arms 20, 2 ,.
0, ..., And the excavation device main body 10, and the up-and-down drive mechanism 30 which elevates and drives the excavation device main body 10, and is provided between the up-and-down drive mechanism 30 and the excavation device main body 10. A swivel drive mechanism 40 for swiveling, a hydraulic unit 50, and a suspension ring 60 are provided.

The elevating and lowering drive mechanism 30 slides up and down in a cylindrical outer cylinder frame 31 having a closed upper end 31a extending vertically around the apparatus axis CT1 and a lower opening 31b of the outer cylinder frame 31. An inner cylinder frame 33 having a bottomed cylindrical shape that is freely fitted, and is provided between a bottom portion 33a of the inner cylinder frame 33 and an upper end portion 31a of the outer cylinder frame 31. It is composed of an elevating telescopic hydraulic cylinder 35 that slides 33 up and down.

The hydraulic unit 50 comprises an upper frame 51 provided on the upper end 31a of the outer cylinder frame 31, and a hydraulic unit main body 55 housed in the upper frame 51.

The suspension ring 60 is provided on the upper end of the upper frame 51, is disposed on the machine axis CT1, and is a hooking portion when the shaft 301 is hung by the crane 301.

The supporting arms 20, 20, ... Are provided on the upper and lower portions of the outer peripheral surface 31c of the outer cylinder frame 31 at three equal intervals in the horizontal plane about the apparatus axis CT1 as shown in FIG. Each support arm 20, 20,
Is a rod 21 that expands and contracts toward the inner peripheral surface 5a of the pile 5.
a telescopic hydraulic cylinder 21 for supporting having a, 21a, ...
, ..., and gripping plates 2 provided at the ends of the rods 21a, 21a, ... Of the telescopic hydraulic cylinders 21, 21 ,.
2, 22, ... Are provided. Grip plates 22, 2
2, ... Have an arc shape along the inner peripheral surface 5a of the pile 5, and the end faces 22a, 22a, ... Of the grip plates 22, 22 ,.
Are formed in a corrugated shape that matches the shape of the inner peripheral surface 5a of the pile 5, as shown in FIG. Grip plates 22, 2
, ... are pin 2 with respect to the rods 21a, 21a ,.
Are joined together by 3, 23, ... And are rotatable in the horizontal direction.

Below the gripping plates 22, 22, ..., Fall prevention plates 7, 7 ,.
The bagging mortars 9, 9, ... Are loaded in the positions between the piles 5 and the vertical shafts 2 at the positions corresponding to the grip plates 22, 22 ,.

As shown in FIG. 1, the swivel drive mechanism 40 includes a first swivel drive mechanism 41 for swiveling the excavator body 10 around a vertical first swivel centerline CT2, and a first swivel drive mechanism 41. The second turning centerline CT3 is provided with a second turning drive mechanism 45 that turns around a second turning centerline CT3 that is parallel and eccentric to the first turning centerline CT2.
Coincides with the device axis line CT1.

The second turning drive mechanism 45 includes the inner cylinder frame 3
Second turning hydraulic motor 46 provided on the bottom 33a of
And the second turning center line C on the bottom 33a of the inner cylinder frame 33.
A second turning gear 47 is provided that is turnable around T3 and is driven to turn by a second turning hydraulic motor 46, and a turning frame 48 that is turnable together with the second turning gear 47 is provided.

The first turning drive mechanism 41 includes the turning frame 4
8 is mounted on the lower end receiving portion 48a of the first rotation center line CT2.
It is provided with a first turning gear (similar to reference numeral 42 in FIG. 4) which is not shown in FIG. 1 and which is provided so as to be freely turned around, and a first turning hydraulic motor 43 which turns and drives the first turning gear. .

The excavator main body 10 is provided with a main body frame 11 which can be swiveled together with a first swivel gear (not shown), a working arm 14 which can be rotationally and flexibly driven in a vertical plane, and provided at the tip of the working arm 14. And a scooping bucket 16 and a scooping bucket 1
The drilling machine 1 provided at the tip of the working arm 14 instead of 6
It consists of nine. The working arm 14 includes a rotation driving hydraulic cylinder 12 and a bending / expanding driving hydraulic cylinder 13.
The scooping bucket 16 includes a scooping hydraulic cylinder 15. In addition, the drilling machine 19 is a drill 19
a, a movement drive unit 19b for driving the drill 19a forward and backward in the drilling direction, and an attachment unit 19c for attaching the drill 19a to the tip of the working arm 14.

The supporting telescopic hydraulic cylinders 21, 21,
..., the elevating telescopic hydraulic cylinder 35, the second turning hydraulic motor 46, the first turning hydraulic motor 43, the rotation driving hydraulic cylinder 12, the bending and stretching driving hydraulic cylinder 13, the scooping hydraulic cylinder 15, and the hydraulic unit main body 55. Connected to and controlled. The hydraulic unit body 55 itself is driven by electric power supplied from the ground via a cable (not shown).

Further, the excavator body 10 has an operating portion 17 for sending a control command to the hydraulic unit body 55. In addition, the first turning hydraulic motor 43, the rotary driving hydraulic cylinder 12, the bending / expanding driving hydraulic cylinder 13, and the scooping hydraulic cylinder 15 are provided with their own hydraulic units (not shown), and the operating portion 17 is provided in the hydraulic unit. The control command may be sent, and the hydraulic unit main body 55 may be configured to send the control command by an operating device (not shown) provided on the ground.

On the bottom face 2b of the shaft 2, a bucket 3 for raising and lowering is lifted up and down by a second crane 302 or the like.
Is placed.

The vertical shaft excavating device 100 and the like according to the first embodiment has the above-described structure. Below is the shaft digging equipment 10
The method of constructing the deep foundation pile 5 in which the vertical pile 2 is excavated using 0 and the cylindrical pile 5 is installed in the vertical shaft 2 will be described.
Note that the following description will be given from the state after the initial excavation of the vertical shaft 2. The initial excavation of the vertical shaft 2 is performed using an excavator such as a backhoe or a blasting machine.

First, as shown in FIG. 3, the fall prevention plates 7, 7, are provided inside the pile 5 at positions corresponding to the respective support arms 20, 20, ...
Attach…. The pile 5 has fall prevention plates 7, 7, ...
A large number of bolt holes 5b, 5b, ... For attaching the are formed in advance. .. are provided at the two height positions of the pile 5 by using the bolt holes 5b, 5b ,. The three fall prevention plates 7, 7, ... At the same height position are circumferentially provided at equal intervals as shown in FIG.

Further, each of the fall prevention plates 7, 7, ... Is projected toward the center of the pile 5 (that is, the device axis CT1), and
As shown in Fig. 3, it is a plate that forms an arc along the inner peripheral surface 5a of the pile 5, and on the center side (inside) of the pile 5, as shown in FIG. 7a, 7a, ...
have. A plurality of bolt holes 7b, 7b, ... Are formed through the outer ends of the fall prevention plates 7, 7 ,. The bolt holes 7b, 7b ,.
b, 5b, ..., and these bolt holes 7b, 7b,
Connection bolts 8, 8, ... Are inserted through. .. and the piles 5 are fixed by tightening the connection bolts 8, 8, ....

Next, before the piles 5 are inserted into the vertical shaft 2 and installed, the fall prevention plates 7, 7, on the inner peripheral wall 2a of the vertical shaft 2 are installed.
The bagging mortars 9, 9, ... Are loaded in positions corresponding to the upper vicinity of the. Therefore, the pile 5 is inserted into the vertical shaft 2 and installed. Then, the positions of the fall prevention plates 7, 7, ... Around the upper vicinity are brought close to the inner peripheral wall 2a of the vertical shaft 2 through the bagging mortar 9, 9 ,.

Next, as shown in FIG. 1, the shaft excavating device 100 is carried into the pile 5. During this loading, the rods 21a, 21 of the supporting telescopic hydraulic cylinders 21, 21 ,.
are contracted so that they do not get caught on the fall prevention plates 7, 7, ... Inside the pile 5.

The loading is carried out by suspending the suspension ring 60 by a crane 301 on the ground and lowering it downward. Then, the three support arms 20, 20, ... At the lower position of the vertical shaft excavating device 100 are provided with the fall prevention plates 7, 7, at the upper position.
When passing through, each supporting telescopic hydraulic cylinder 2
The rods 21a, 21a, ... Of 1, 21, ... Are extended to such an extent that they do not contact the inner peripheral surface 5a of the pile 5, and the shaft excavating device 100 is further lowered, and the three support arms 20 in the lower position,
20, ... are the three lower fall prevention plates 7,
Place on 7, ... This allows the pile 5 to support the vertical load of the vertical shaft excavation device 100.

Also, the three support arms 20 and 2 in the lower position
, And the three support arms 20, 20, ... at the upper position are further extended, and the grip plates 22, 22, ... Are pressed against the inner peripheral surface 5a of the pile 5. As shown in FIG. 3, the grip plates 22, 22, ...
Since they are joined by 23, ... And are rotatable in the horizontal direction, they can be closely attached to the inner peripheral surface 5a of the pile 5.

Since the bagging mortars 9, 9, ... Are loaded in the positions between the piles 5 and the vertical shafts 2 corresponding to the grip plates 22, 22 ,. Two
0, ... Can obtain a sufficient reaction force without deforming the pile 5. Therefore, as shown in FIG.
It is possible to fix the device axis line CT1 of the device by aligning it with the center of the pile 5.

Further, the grip plates 22, 22, ... Are pressed against the inner peripheral surface 5a of the pile 5, whereby the shaft excavating device 1
The vertical load of 00 can be supported together with the support of the three lower fall prevention plates 7, 7 ,. This supporting force is applied to the end faces 22 of the grip plates 22, 22, ....
.. are formed in conformity with the shape of the inner peripheral surface 5a of the pile 5 having a corrugated vertical section as shown in FIG. 3, and the supporting arms 20 are formed by the bagging mortars 9, 9 ,.
20 ... can obtain a sufficient reaction force,
Has been increased. Therefore, a larger supporting force can be obtained.

Therefore, the excavator body 10 can be more easily installed in the shaft 2 of FIG. 1 as compared with the case where the guide rail is provided as in the conventional case, and the excavator body can be installed more easily than in the case of the mini excavator. , The posture can be more stable.

At this time, the three upper support arms 20, 20, ... Are arranged with a gap immediately above the three upper fall prevention plates 7, 7 ,. As a result, even if the above-mentioned installation is carried out perfectly, in the unlikely event of an unexpected earthquake or the like, the three support arms 20, 2 in the lower position should be provided.
It is possible to prevent the vertical shaft excavation device 100 from falling when 0, ... Damages the three fall prevention plates 7, 7 ,.

Further, it is possible to secure a wider working space as compared with the case where the guide rail is provided.

Now, the working arm 14 of the excavator body 10
If the hole drilling machine 19 is mounted on, the operation portion 17 can be operated to freely form a hole (not shown) for charging on the bottom face 2b of the vertical shaft 2. In addition, the excavator body 10
If the scooping bucket 16 is attached to the working arm 14 of No. 1, the bottom face 2b of the vertical shaft 2 after the blasting is misaligned (not shown).
Can be loaded into the digging bucket 3.

Since the excavator body 10 can be vertically moved up and down by the elevating and lowering drive mechanism 30, the vertical working range is expanded, and since the swivel drive mechanism 40 can be horizontally swiveled, the horizontal working range is expanded. It Therefore, it is possible to reduce or eliminate manual work in a range that the excavator main body 10 does not reach, and it is possible to perform work more easily and quickly.

In the horizontal movement and turning of the excavator body 10, the swivel drive mechanism 40 drives the excavator body 10 to swivel about the first swivel centerline CT2, and a first swivel drive mechanism 41, The second turning center line C is eccentric with respect to the first turning center line CT2.
Since the second turning drive mechanism 45 that turns around T3 is provided, the center position of the excavator body 10 can be moved in the horizontal direction. Therefore, the excavator body 1
The blind spot in the horizontal working range of the excavator body 10 such as immediately below 0 can be further reduced, the working space can be effectively used, and the horizontal moving range can be expanded. Therefore, the work can be performed more easily and quickly.

FIG. 4 is a vertical shaft excavating device 20 according to the second embodiment.
It is a figure showing 0, and this shaft excavation equipment 200 is provided with the following composition in addition to the composition with which the shaft excavation equipment 100 of a first embodiment of Drawing 1 is provided. That is, first, the shaft excavating device 200 of FIG. 4 is brought into contact with the bottom face 2b of the shaft 2,
A support column 210 that supports the excavator body 10 is provided.
One of the columns 210 is provided around the apparatus axis CT1 and includes a guide cylinder 211, a main body support center shaft 212 slidably fitted in a lower end opening 211a of the guide cylinder 211, and a main body support center. Shaft 21
It is composed of a shaft hydraulic cylinder 213 that slidably drives 2 and is freely extendable and contractible.

Therefore, since the vertical load of the vertical shaft excavating device 200 is reliably supported by the columns 210, the posture of the vertical shaft excavating device 200 can be made more stable. Further, since only one support column 210 is provided on the device axis CT1, even if the bottom face 2b has an uneven surface, the support column 2 is not provided.
There is no concern that the horizontal balance will be lost due to the reaction force of 10. Furthermore,
Since the support column 210 can be freely extended and retracted, the excavator body 10 can be raised and lowered. Therefore, as in the first embodiment, the working range of the excavator body 10 in the vertical direction can be expanded,
Work can be performed easily and quickly.

The vertical shaft excavating device 200 is provided in the excavating device main body 10 and is provided with a plurality of cameras 220, 220 for photographing the inside of the vertical shaft 2 and a remote controller 230. The remote controller 230 is installed on the ground. The main body of the operating device 240 to be installed
And the operation drive unit 260 that is communicatively connected to the operation machine body 240 via the cable 250 and is provided in the operation unit 17 of the excavation machine body 10, and the camera 22 via the cable 250.
Monitor 270 that outputs images taken at 0 and 220
And The operating device main body 240 has a camera operating lever 241 and an excavating device main body operating lever 245, and the operation drive unit 260 is, for example, the excavating device main body 10.
The electric power cylinder 261 for operating the lever 17a of the operating section 17 of FIG.

Further, the plurality of cameras 220, 220 are provided in the excavator body 10 via the turning drive devices 221, 221, respectively, and the turning drive devices 221, 2 22 are provided.
21 is communicatively connected to the controller body 240 via a cable 250. That is, each camera 220, 220
The shooting direction can be changed by operating the camera operation lever 241 of the operation device main body 240.

Therefore, the operation work of the excavator body 10
Since it can be performed in a suitable environment such as on the ground, the working environment can be improved.

Incidentally, as shown in FIG.
0, 120, ... are plural toward the inner peripheral wall 2a of the vertical shaft 2,
Any structure may be used as long as it is radially extendable and retractable and supports the excavator body 10.
The supporting arms 120, 120, ... May be provided around the hydraulic unit 50 by three.

Further, as shown in FIG. 6, the fall prevention plate 10
7 may have any structure as long as it supports the support arms 120, 120, ... And may be an annular fall prevention plate 107.

[0053]

According to the shaft excavating device of the first invention of the present invention, the support arms are fixed to the shaft by radially extending the plurality of support arms toward the inner peripheral wall of the shaft,
The excavator body can be supported. Therefore, as compared with the case where the guide rail is provided, the excavator main body can be installed more easily on the vertical shaft, and the posture thereof can be made more stable as compared with the case of the mini hydraulic excavator.

Further, it is possible to secure a wider working space as compared with the case where the guide rail is provided.

According to the shaft excavating device of the second aspect of the present invention, in addition to the above effects, the vertical load of the shaft excavating device can be reliably supported by the support columns, and the horizontal position is held by the support arm. Therefore, the posture of the shaft excavating device can be more stabilized.

According to the shaft excavating device of the third invention of the present invention, in addition to the above-mentioned effect, the excavating device main body can be moved up and down by driving the support column to expand and contract. The working range of is expanded. Therefore,
Work can be performed easily and quickly.

According to the shaft excavating device of the fourth invention of the present invention, in addition to the above-mentioned effects, since the working range in the vertical direction of the excavating device main body is expanded by the elevating drive mechanism, the work is further facilitated and quick. Can be done.

According to the shaft digging device of the fifth aspect of the present invention, in addition to the above-mentioned effects, since the horizontal working range of the digging device body is expanded, the work can be performed more easily and quickly. .

According to the shaft excavating device of the sixth invention of the present invention, in addition to the above-mentioned effects, since the operation work of the excavating device main body can be performed in a suitable environment such as on the ground, the work environment can be improved. Can be improved.

According to the method for constructing a deep foundation pile of the seventh invention of the present invention, in addition to the same effect as that of the first invention, the vertical shaft excavating device is supported by the fall prevention plate. A large supporting force can be obtained as compared with the case where the supporting arm is supported by the frictional force between the supporting arm and the inner peripheral surface of the pile. Further, this makes it possible to stabilize the posture of the vertical shaft excavating device.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a shaft excavating device of the present invention.

2 is a cross-sectional view taken along the arrow XX of the shaft excavating device of FIG.

FIG. 3 is a view showing a fall prevention plate for a pile on which the shaft excavating device of FIG. 1 is installed.

FIG. 4 is a front view showing a main part of a second embodiment of a shaft excavating device of the present invention.

FIG. 5 shows another embodiment of the support arm.

FIG. 6 is a view showing another embodiment of the fall prevention plate.

[Explanation of symbols]

 2 ... Vertical shaft 2a ... Inner peripheral wall 2b ... Bottom face 5 ... Pile 7, 107 ... Fall prevention plate 10 ... Excavator main body 20, 120 ... Support arm 30 ... Lifting drive mechanism 40 ... Slewing drive mechanism 100 ... Vertical shaft excavator (first Embodiment) 200 ... Vertical shaft excavation device (second embodiment) 210 ... Support 220 ... Camera 230 ... Remote controller 240 ... Controller body 270 ... Monitor

Claims (7)

[Claims] 1. A vertical shaft excavating device having an excavating device main body for excavating a vertical shaft, comprising a plurality of support arms which are provided so as to extend and contract in a radial direction toward an inner peripheral wall of the vertical shaft and support the excavating device main body. A shaft excavating device characterized by being provided. 2. The shaft excavating device according to claim 1, further comprising a column that is in contact with a bottom face of the shaft and supports the excavating device main body. 3. The shaft excavating device according to claim 2, wherein the support column is capable of expanding and contracting. 4. An elevating and lowering drive mechanism which is provided between the plurality of support arms and the excavation equipment main body and elevates and drives the excavation equipment main body.
A shaft excavator according to any one of 1. 5. The shaft excavator according to claim 1, further comprising a swivel drive mechanism that swivels and drives the excavator body. 6. A camera provided in the excavator body, for photographing the inside of the shaft, and a remote controller, wherein the remote controller remotely controls the excavator body, and the remote controller. The shaft excavating device according to any one of claims 1 to 5, further comprising a monitor that outputs an image captured by a camera. 7. A method of constructing a deep foundation pile, comprising excavating a vertical shaft by using the vertical shaft excavating device according to claim 1, and installing a cylindrical pile in the vertical shaft, wherein the vertical shaft is provided on an inner peripheral surface of the pile. A construction method for a deep foundation pile, characterized by providing a fall prevention plate for supporting a support arm of an excavator.